482 ZOOPHYTES. 



an inch thick; summit branchlets J of an inch thick, gradually 

 tapering. Corallum scabrous ; apical calicle nearly a line broad ; 

 the lateral, rather crowded, equal, nariform, and dimidiate, and very 

 much compressed, hardly stout, 1 to H lines long, obsolescent on 

 the inferior side of the branches ; margin not incrassate ; aperture 

 oblong ; star distinct, two of the lamellae quite prominent. 



Plate 40, fig. 4, part of corallum, natural size ; 4 a, extremity of 

 branch ; 4 b, profile of calicle. 



Singapore, East Indies. Exp. Exp. 



This arborescent species resembles, somewhat, the cervicornis, but 

 differs in its slender, narrow, lateral calicles, the small apical calicle, 

 and in other particulars. It grows to a height of eighteen inches or 

 more. 



Madrepora muricata, Esper, Pflanz. Fortsetz. i. 55, tab. 52 ; the figure is tolerably 

 good, and the description better. Esper alludes to the much smaller size of the calicles 

 on the inferior side of the branches. His specimen was from the East Indies. 



Madrepora cervicornis, in part, of Lamarck. 



57. MADREPORA GRACILIS. (Dana.} 



M. arborescens, late ramosa, ramis gracilibus, bene teretibus, 3-5'" eras- 

 sis, arcuatis, sensim attenuatis. Corallum kve, caliculo apicali lineam 

 longo et lato ; lateralibus cequalibus, subconfertis, validis, compresso 

 nariformibus, parvulis (!'" longis), aperturd angustd, stelld conspicud, 

 duabus lamellis prominulioribus. 



Arborescent, spreading ramose ; branches slender, neatly terete, 3 to 5 

 lines thick, arcuate, gradually attenuate. Corallum smooth ; apical 

 calicle a line long and broad ; the lateral equal, rather crowded, 

 stout, compressed-nariform, small (1 line long); aperture narrow, 

 star distinct, and two of the lamellae most prominent. 



Plate 41, fig. 3, part of corallum, natural size; 3 , extremity of 

 branch ; 3 b, calicle, natural size. 



The Feejee Islands and Sooloo Sea. Exp. Exp. 



A very neat and graceful species, with small and equal nariform 



